PoS - Proceedings of Science
Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - QCD and Hadronic Physics
The onset of spin rotation effects in electroproduction of heavy quarkonia
M. Krelina*, J. Nemchik, R. Pasechnik and J. Cepila
Full text: pdf
Pre-published on: June 10, 2020
Published on: November 12, 2020
We discuss the Melosh spin rotation effects in diffractive photo- and electroproduction of heavy quarkonia off a nucleon target in the dipole picture. The quarkonium light-front wave functions are obtained in the Schroedinger equation based formalism using the realistic interquark interaction potentials. A strong onset of spin rotation effects predicted in the case of $J/\psi(1S)$ photoproduction enables us to reach a reasonable agreement with the available data. In the case of radially excited $2S$ and $3S$ states these effects are even stronger as a direct manifestation of the nodal structure of their wave functions. In particular, the spin effects enhance the $\Psi'(2S)$ cross section by a factor of $2-3$ and therefore cause a substantial increase of the $\Psi'(2S)$-to-$J/\Psi(1S)$ ratio improving the description of experimental data.
DOI: https://doi.org/10.22323/1.364.0496
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.